Quadra Island is an island off the eastern coast of Vancouver Island, British Columbia, Canada, part of the Discovery Islands located within the Strathcona Regional District. Quadra Island is about 35 km (22 miles) from its northernmost point to its southernmost point. The island at its narrowest point, on its southern peninsula, is less than 2 km (1.25 miles) wide, and at its widest point, about 15 km (9 miles) wide. In area Quadra island comprises about 310 square km (120 square miles). The population of island and surrounding mainland inlets, as of the 2006 federal census (excluding First Nations Reserves, tallied separately), was 2,472, down from the 2001 federal census count of 2,548. In 1903 it was named after the Spanish navigator Juan Francisco de la Bodega y Quadra, who explored and settled the Vancouver Island area in the late 18th century.[1] It is separated from Vancouver Island by Discovery Passage, and from Cortes Island, and is linked to that island by a ferry from Heriot Bay on its eastern shore. The island has many beaches, trails, lakes, and parks. Main Lake Provincial Park is located on the northern part of the island, and Rebecca Spit Marine Provincial Park is on the eastern shore, near Heriot Bay.

There is an elementary school on the island. Schoolchildren in grades 6–12 travel by ferry to Campbell River to attend École Phoenix Middle School or Carihi Secondary School. The Cape Mudge Reserve on the southern tip of the island is home to the We-wai-kai, one of the main bands comprising the Southern Kwakiutl (the other being the We-wai-kum based in Campbell River on Vancouver Island). Together they are known as the Laich-kwil-tach (historically known as the Euclataws or Yucultas, names more familiar to speakers of British Columbia English). The Nuyumabalees Cultural Centre is located within the Cape Mudge Village and holds an important collection of art from earlier times, items that were repatriated after many years from museums elsewhere.[2]